Resetting the service light on your Mercedes E350 can seem daunting. This guide provides a clear, step-by-step process for a 2009 E350, though similar procedures may apply to other model years. Successfully resetting this indicator yourself can save you a trip to the dealership.
Resetting Your 2009 Mercedes E350 Service Light
This process utilizes the buttons on your steering wheel and the instrument cluster display. Follow these instructions carefully:
Step 1: Key Position and Initial Display
- Enter your vehicle and close all doors.
- Insert your key into the ignition and turn it to position 1. This activates the electronics without starting the engine.
- If the temperature/mileage display isn’t visible, use the left rectangle button (marked with a “window” graphic) on your steering wheel to navigate to it. This button cycles through the menu options.
Step 2: Reset Button Activation
- Locate the black plastic reset button on the left side of the instrument cluster frame, near the speedometer.
- Quickly press this reset button three times. Avoid pressing and holding, as this resets the trip odometer. The display should show “UB: 11.9V”.
Step 3: Navigating the Service Menu
- Press the down-arrow button (sub-menu button) located on the steering wheel once. This will display the ‘Service Menu.’
- Use the +/- buttons (Selection Marker) on the right side of the steering wheel to scroll through the sub-menus until you find ‘Confirmation.’
Step 4: Confirming the Service Reset
- Press the right rectangle button (Next Menu) on the left side of the steering wheel to select the ‘Confirmation’ menu.
- Use the +/- buttons again to scroll to ‘Full Service.’
- Press the right rectangle button (Next Menu) once more. The display should now read “Service Confirmed.”
Step 5: Exiting the Menu
- Press the left rectangle button (Previous Menu) multiple times to back out of the service menu options and return to the main display.
Confirmation:
Drive your car for a short distance. The service message should no longer appear on your instrument cluster. If it persists, repeat the process or consult your owner’s manual.
Understanding Steering Wheel Button Functions
For clarity, remember these key functions:
- Rectangle Buttons (Menu Navigation): The left rectangle button selects the previous menu, while the right rectangle button selects the next menu.
- +/- Buttons (Sub-menu Selection): These buttons allow you to scroll up and down within a specific menu.
- Arrow Buttons (Within Sub-menu Navigation): These buttons help you navigate options within a selected sub-menu. While page 149 of the owner’s manual describes settings navigation, it may not include the service light reset procedure outlined above.
